I set up a site using Flatten and I installed Parallax banners on a few pages, top and bottom. They displayed nicely, UNTIL...the other day they suddenly pulled up short, not stretching all the way across the page as before. It depends on the browser, but it is the worst on Chrome. I uploaded an image at 2200px across and that fixed it. But here's the deal, I set up a dummy site to try to work out some issues and I uploaded the Flatten demo content, and guess what, your demo content doesn't display correctly either. Here, check it out. http://e-watchman.com/2014/?page_id=12